TRANSMISSION CIRCUIT, RECEPTION CIRCUIT, TRANSMISSION METHOD, RECEPTION METHOD, COMMUNICATION SYSTEM AND COMMUNICATION METHOD THEREFOR

摘要

To reduce the coding loss in transmission of valid data while establishing early symbol synchronization between a transmission side and a reception side in transmission of channel-coded serial data. A transmission circuit selects first channel coding (for example, 8B/10B) capable of early establishment in an idle period during which valid data is not transmitted, and transmits symbols for synchronization that have been coded by the first channel coding. A reception circuit receives the symbols to establish the symbol synchronization, and maintains the symbols. In transmission of valid data, the transmission circuit transmits symbols indicating a packet starting position, selects second channel coding (for example, 64B/66B) having less coding loss than the first channel coding, and transmits the valid data that has been coded by the second channel coding. Upon receiving the symbols indicating the packet starting position, the reception circuit receives the valid data by switching to the reception using the second channel coding method.